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Errors in feeding experiments with cross-bred pigs

Published online by Cambridge University Press:  27 March 2009

Reginald Arthur Berry  and
Daniel Grant O'Brien
Reginald Arthur Berry
Affiliation:
Professor of Agricultural Chemistry
Daniel Grant O'Brien
Affiliation:
Chemistry Department, now Lecturer in Agriculture, West of Scotland College of Agriculture, Glasgow.
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Extract

The probable error on one pig calculated on the average daily live weight increase was found to be for cross-bred pigs about 7 per cent.; for pure-bred pigs from the same litter and each of similar live weight about 3 per cent.; for cross-bred pigs each of similar live weight but from different parents about 4 per cent.

The error is greatest in experiments of short duration and it decreases as the period of the experiment is lengthened. The decrease is slight if the experiment is prolonged beyond seven weeks.

The errors on 18 separate pens containing four pigs to each pen (the total initial live weight of each pen being similar) varied from 2·3 per cent, to 12·08 per cent., the average being 6·21 per cent.

The percentage probable error is relatively low when the pigs are fattening rapidly and high when the pigs are fattening slowly. The average daily increase of the quicker fattening female pigs when un-speyed appears to be depressed as a result of periodic sexual disturbances.

The stage of fattening does not appear to influence the probable error. Animals in the later stages of fattening show a greater range in their rate of fattening than animals in the early stages, see Fig. 2, p. 284.

Weekly weighing of individual pigs is recommended as it gives an indication of the health of each pig. It also enables each experimenter to discriminate between differences in the rate of fattening due to individuality and differences due to ill health, etc.

The rate of fattening of pigs is very variable, periods of rapid fattening are followed by periods of depression.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 11 , Issue 3 , July 1921 , pp. 275 - 286
Copyright
Copyright © Cambridge University Press 1921

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References

page 276 note 1 “Report on Seven Experiments on the Feeding of Pigs” (Bull. 57, Tenth and Eleventh Annual Report) West of Scotland Agric. College, Glasgow.Google Scholar

page 276 note 2 Wood, T. B. and Stratton, F. J. M., “Interpretation of Experimental Results.” This Journal, 3, pt. iv, 1910, pp. 417–440.Google Scholar

page 276 note 3 Robinson, G. W. and Hainan, E. T., “Probable Error in Pig Feeding Trials.” This Journal, 5, pt. i, 1912, pp. 48–51.Google Scholar

page 276 note 4 Berry, R. A., “Errors in Pig Feeding Experiments.” Science Progress, 01 1913, No. 27.Google ScholarTrans. British Assoc., Sec. 1–9, 1912.Google Scholar

page 276 note 5 Crowther, Charles, “Probable Error in Pig Feeding Trials.” This Journal, 7, pt. ii, 1915, pp. 137–142Google Scholar; see also Mitchell, and Grindley, , “Element of Uncertainty in the Interpretation of Feeding Experiments,”Google Scholar University of Illinois, Agric. Exp. Station, Bull. 165, 1913, 07.Google Scholar

page 281 note 1 Iowa State College. Bull. 91.Google Scholar

page 281 note 2 The average rate of fattening of any breed taken as a whole will depend upon the attention which breeders have paid to developing this characteristic of the breed. There are strains in all breeds of pigs which are capable of fattening rapidly. In some breeds these strains have been neglected, in others developed.

page 282 note 1 Crowther, , Charles. Loc. cit.Google Scholar